Question

This passage explores the historical debate surrounding the origins of Proto-Indo-European languages.

For decades, historical linguists and archaeologists have debated the origins of the Proto-Indo-European (PIE) language family. In the mid-twentieth century, archaeologist Marija Gimbutas proposed the Kurgan hypothesis, which posits that PIE speakers were pastoral nomads residing in the Pontic-Caspian steppe. According to Gimbutas, these pastoralists expanded rapidly in several waves during the fourth and third millennia BCE, fueled by a key technological package: horse domestication and wheeled vehicles. This expansion, she argued, disseminated PIE across Europe and parts of Asia, replacing or merging with indigenous, non-Indo-European cultures.

Gimbutas constructed her argument by first establishing the archaeological footprint of the Kurgan culture. She highlighted the sudden appearance of distinctive burial mounds, or kurgans, containing weapons and horse remains in regions far from the steppe. This initial archaeological evidence was subsequently bolstered by comparative linguistics. Linguists noted that widely separated Indo-European languages shared cognates for words related to metallurgy, wheeled transport, and equestrianism. Since these technologies only emerged in the archaeological record around 4000 BCE, the linguistic commonality suggested that the undivided parent language could not have split before this period, aligning perfectly with the timeline of Kurgan expansion.

However, the argument encountered opposition. Proponents of the Anatolian hypothesis, introduced in the late 1980s, argued instead that Indo-European languages spread peacefully from agricultural Anatolia starting around 7000 BCE. To defend the Kurgan model against this early-expansion alternative, modern researchers have integrated ancient DNA (aDNA) analysis. Recent paleogenomic studies have revealed a massive genetic turnover in central Europe during the early Bronze Age, with a vast majority of the male lineage tracing back to the Yamnaya culture (successors to the Kurgan culture). By placing this genetic evidence at the culmination of the argument, proponents of the Kurgan model did not merely add another dataset; they effectively bridged the gap between archaeological speculation and linguistic reconstruction, establishing a biological link that correlates precisely with the hypothesized migration routes and timeline.

Based on the passage, what is the primary function of sequencing the archaeological and linguistic evidence before the introduction of ancient DNA analysis?